解析​PHP获取标题的拼音首字母（附代码示例）

    public function getfirstchar($s0)    {        $fchar = ord($s0{0});        if($fchar >= ord("A") and $fchar <= ord("z") ) return strtoupper($s0{0});        $s1 = mb_convert_encoding($s0,"GBK","UTF-8");//iconv("UTF-8","GBK", $s0);        $s2 = mb_convert_encoding($s1,"UTF-8","GBK");//iconv("GBK","UTF-8", $s1);        if($s2 == $s0){$s = $s1;}else{$s = $s0;}        $asc = ord($s{0}) * 256 + ord($s{1}) - 65536;        if($asc >= -20319 and $asc <= -20284) return "a";        if($asc >= -20283 and $asc <= -19776) return "b";        if($asc >= -19775 and $asc <= -19219) return "c";        if($asc >= -19218 and $asc <= -18711) return "d";        if($asc >= -18710 and $asc <= -18527) return "e";        if($asc >= -18526 and $asc <= -18240) return "f";        if($asc >= -18239 and $asc <= -17923) return "g";        if($asc >= -17922 and $asc <= -17418) return "h";        if($asc >= -17922 and $asc <= -17418) return "i";        if($asc >= -17417 and $asc <= -16475) return "j";        if($asc >= -16474 and $asc <= -16213) return "k";        if($asc >= -16212 and $asc <= -15641) return "l";        if($asc >= -15640 and $asc <= -15166) return "m";        if($asc >= -15165 and $asc <= -14923) return "n";        if($asc >= -14922 and $asc <= -14915) return "o";        if($asc >= -14914 and $asc <= -14631) return "p";        if($asc >= -14630 and $asc <= -14150) return "q";        if($asc >= -14149 and $asc <= -14091) return "r";        if($asc >= -14090 and $asc <= -13319) return "s";        if($asc >= -13318 and $asc <= -12839) return "t";        if($asc >= -12838 and $asc <= -12557) return "w";        if($asc >= -22605 and $asc <= -11848) return "x";        if($asc >= -11847 and $asc <= -11056) return "y";        if($asc >= -11055 and $asc <= -10247) return "z";        return NULL;    }

    public function pinyin_long($zh)    {        $ret = "";        if(empty($zh))        {            $ret="x";        }else{            $s1 = mb_convert_encoding($zh,"GBK","UTF-8");            $s2 = mb_convert_encoding($s1,"UTF-8","GBK");            if($s2 == $zh){$zh = $s1;}            for($i = 0; $i < strlen($zh); $i++){                $s1 = substr($zh,$i,1);                $p = ord($s1);                if($p > 160){                    $s2 = substr($zh,$i++,2);                    $ret .= $this->getfirstchar($s2);                }else{                    $ret .= $s1;                }            }        }        return $ret;    }